Smoke-consuming boiler-furnace.



PATENTBD AUG? 20, 1907.

H; H. FREEMAN. SMOKE cousnmme BOILER FURNACE.

APPLICATION FILED 00'1.11,190fl.

w\ $1 N r. m GEMN W T WITNESSES.

IINVE'NTORLI Z4312. MA;

THE NcRRxs PETERS co, WASHINGTON, 174 c.,

HENRY I-I. FREEMAN, OF WILKINSBURG, PENNSYLVANIA.

SMOKE-CON SUMIN G BOILER-FURNACE.

Specification of Letters Patent.

Patented Aug. 20, 1907.

Application illetl October 11, 1906. Serial No. 338,493-

To all whom it may concern:

Be it known that I, HENRY H. FREEMAN, a resident of W ilkinsburg, in thecounty of Allegheny and State of Pennsylvania, have invented a new anduseful Improvement in Smoke-Consuming Boiler-Furnaces; and I do herebydeclare the following to be a full, clear, and exact descriptionthereof.

This invention relates to furnaces and more especially to steam boilerfurnaces.

The object of the invention is to improve furnaces by providing deviceswhich secure a more perfect combustion of fuel, thus preventing, or atleast reducing, the smoke and also increasing the efficiency of thefurnace.

The invention consists of the appliances and their arrangement ashereinafter described and claimed.

In the accompanying drawing, Figure 1 is a vertical longitudinal sectionthrough a locomotive fire box and a portion of the boiler showing myinvention applied thereto. Fig. 2 is a vertical transverse section onthe line 22, Fig. 1, and Fig. 3 is a portion of Fig. 1 on an enlargedscale.

In the drawing, the locomotive fire box is indicated at 1, having theusual grate bars 2 and having above the same the steam collecting space3 of the boiler. The boiler shell is indicated at 4 and the fire fluesat 5, the latter being secured in the flue sheet 6, forming the end wallof the fire box. The top wall or hood of the fire box is shown at 7. Thefire lines 5 constitute a heat absorbing element.

My invention comprises appliances for mixing air with the products ofcombustion before they pass into the fire flues of the boiler. Theappliances shown comprise a wall, or partition 9, extending verticallyand located in front of the fire lines and having the annular horizontalportion 10 whose edge is secured to the flue sheet 6 by means of rivets11, thus forming a supplemental chamber 12 in front of the fire flue.The wall 9 is provided with openings 14 and with conical nozzles 15projecting into the supplemental combustion chamber 12. Outside of thewall 9 is another wall 17 also having an annular horizontal portion 18whose edge is joined to the edge of the wall 9, thus forming an chamber19 between said walls. The outer wall 17 is provided with openings 20and has nozzles 21 leading from said openings and projecting into thenozzles 15 of the inner wall. The air chamber 19 between these walls hascommunication with the outside atmosphere in any suitable way, such aspipes 22 leading from said chamber and extending out through the wallsof the fire box, preferably being directly forwardly as shown. Locatedbetween the chamber 19 and the wall 9 is a partition plate 24 which hasopenings to permit the nozzles 21 to project through the same. Thispartition plate is provided with perforations 25 surrounding the nozzles21, through which perforations the air passes from the chamber 19 intothe nozzles 15.

burning out, they are preferably so constructed that they can be watercooled such as by making them double, with water chamber 27 between thesame, and providing a suitable water connection. This is accoin plishedby providing a Water connection 28 from the boiler to the bottom of theWater chamber of the inner member and providing openings 29 between thewater chambers of the inner and \outer chambers, both at top and bottom,and providing a steam outlet 30 leading from the top of the waterchambers and projecting into the steam collecting space of the boiler.As a result there is a circulation through the chambers of these walls,said circulation receiving the cold water from the bottom of the boiler.

In the use of my invention, the fuel, such as coal, is burned on thegrate 2 in the usual way, the fire chamber 1 being the main orpreliminary combustion chamber. The products of combustion pass throughthe nozzles 21 and into the nozzles 1.5, thereby drawing in a certainamount of air from the chamber 19 which air is I In order to prevent theseveral walls or plates from I 15, said mixture then passing into thesupplemental combustion chamber 12 where the oxygen in the air consumesthe unoxidized portions of the products of combustion and the completelyoxidized products of usual way.

The action of the device described will be readily understood from thisdescription. These appliances are simple and can be applied to any formof furnace, whether a steam boiler furnace, or the like. In case offurnaces other than steam boiler furnaces, the fire fiues 5 will berepresented by some other heat absorbing element.

What I claim is:-

1. In a furnace, the combination of a heat absorbing element, a fuelcombustion chamber in front or said heat absorbing element, a wallseparating the heat absorbing element and fuel combustion chamber andproviding a supplemental combustion chamber and having a series ofopenings provided with conical nozzles projecting into the supplementalcombustion chamber, a second wall in front of the first wall providingan air chamber between said walls and having a series of straightnozzles open to the fuel combustion chamber and, projecting into theconical nozzles of the first wall, and a connection from said airchamber to the atmosphere.

2. In a furnace, the combination of a heat absorbing element, a fuelcombustion chamber in front of said heat absorbing element, a wallproviding a supplemental com bustion chamber between the fuel combustionchamber and heat absorbing element, a series of conical nozzles in saidwall and projecting into the supplemental combustion chamber, a secondwall providing an air chamber between the same and the first named wall,a series of straight nozzles in said wall open to the fuel combustionchamber and projecting into the conical nozzles of the first named wall,a plate between the air chamber and the first wall and provided withopenings through which the straight mixed with the products ofcombustion in the nozzles I combustion pass through the fire fiues tothe stack in the for supplying air to the air chamber, the walls formingthe supplen'iental combustion chamber and air chamber being hollow, awater connection from the boiler to said 15 hollow walls, and a steamconnection from the upper portion of said hollow walls to the steamcollecting space of the boiler.

In testimony whereof, I the said HENRY I-I. FREEMAN have hereunto set myhand.

HENRY H. FREEMAN.

Witnesses ROBERT C. To'r'rnN, J. R. KELLER.

